Device for changing the course of a sliver in a draft apparatus



1962 NAOJl ARAKAWA DEVICE FOR CHANGING THE COURSE OF A SLIVER IN A DRAFT APPARATUS Filed May 6, 1955 INVENTOR NAOJI ARAKAWA BY "WM, MMM

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United states Patent 3,045,291 DEVICE FOR CHANGING THE COURSE OF A SLIVER IN A DRAFT APPARATUS Naoji Arakawa, 49 Sakurazukamoto-machi S-chome, Toyonaka, Japan- Filed May 6, 1955, Ser. No. 506,641 1 Claim. (Cl. 19-250) This invention relates to improvements in a draft device of a spinning machine, comprising two groups of pairs of rollers provided on a roller stand, one group being vertical and the other oblique. A sliver from a drawing frame having substantially no twist can be spun into a yarn of a required fineness in a single operation. According to this invention drawing and spinning operations are carried out in a narrow space dispensing with a separate flyer frame, so that the working is simplified and thereby realizing considerable economies in operating costs and the mill installation.

, The accompanying drawing shows a side elevation of the draft device according to this invention. In the drawing, 1 is a roller stand fixed on a spinning machine frame, and bottom rollers 2, 6, 7, 26 and 27 are supported on the roller stand. The numerals 3, 8, 9, 28 and 29 are top rollers respectively cooperating with the bottom rollers. The three pairs of rollers 2-3, 68, and 7-9 are arranged in a Vertical direction, and the other pairs 2628 and 27-29 in an oblique direction. Bottom cradles 10 and 30 are respectively fixed to bars .11 and 31 on the roller stand, and top cradles 12 and 32 are detachably fixed to the bottom cradles by hanging a hook 13 to a projection 14 on the bottom cradle 10, and hanging a hook 33 to a projection 34 on the bottom cradle 30. The hooks 13 and 33 are provided at an end with L-shape levers 15 and 35 which are pivoted by pins 16 and 36 on the top cradles. The levers are operated at their other ends.

There are piece members 17 and 37 respectively pivoted by pins 18 and 38 on the top cradles. The arbors of the rollers 9 and 29 are held at the front parts of the piece members 17 and 37, and springs '19 and 39 which are extended between the back ends of the piece members and the top cradles act to elastically press the rollers 9 and 29 against the corresponding bottom rollers 7 and 27.

Stays 20 and 40 connect both sides of the top cradles 12 and 32, and springs 21 and 41 inserted between the stays and the arbors of the top rollers 8 and 28 make the rollers press down against the bottom rollers 6 and 26. The reaction of the springs tends to swing the top cradles around the projections 14 and 34 so that the top rollers 3, 8 and 28 press the bottom rollers 2, 6 and 26, respectively.

Leather aprons are mounted on the rollers 6, 8, 26 and 28, and their front ends are extended by tensers 22, 23, 42 and 43. A sliver 4 is supplied from a can placed behind the roller stand through a guide roller, not shown, a trumpet '5 and the back rollers 2 and 3, and is sent vertically to the pairs of rollers 6-8 and 7--9, and then obliquely to the pairs of rollers 2628 and 27-29 whereby it is drafted. The back bottom roller 26 of the obliquely arranged group is placed in such a position that the point a where the sliver is nipped by the top and bottom rollers 26 and 28 lies on or adjacent the line perpendicular from the nip point of the front rollers 7 and 9 3,045,291 Fat-outed July 24, 1962 of the vertical group. A line between the centers of the pair of opposed rollers in the oblique group which is closest to the vertical group is perpendicular to the line between the nip points of the said pair of opposed rollers and the lowermost pair of rollers in the vertical group. By this means, the sliver travels under the influence of gravity and smoothly changes its passage from vertical to an oblique direction without requiring any guide member, that is, from the point a to b, the starting point of the oblique direction, being kept between the aprons.

According to this invention, as the rollers of the first group are arranged along a vertical line, the number of pairs of draft rollers can be increased without requiring any more floorspace for the device. If all rollers are arranged in an oblique line as the conventional case, the depth of the device is increased according to the number of rollers increased. This necessarily requires increasing the space on the machine frame behind the roller stand, Where the creels or cans for the slivers are placed. In View of the increased number of draft rollers which can be provided on a limited space of floor by the use of this invention, a yarn of required fineness can be spun in a single operation from a sliver produced by the drawing frame, thus permitting dispensing with a fiyel frame,.

whereby the work is simplified.

In the foregoing explanation three sets of rollers are used in the vertical group, but four or more pairs of rollers can be employed.

What I claim is:

In a spinning machine, a draft device comprising a vertical group of a plurality of pairs of opposed draft rollers and an oblique group of pairs of opposed draft rollers below said vertical group, the opposed rollers in each pair forming a nip point therebetween, the nip point of the pair of opposed rollers in said oblique group closest to said vertical group being adjacent a vertical line from the nip point of the lowermost pair of opposed rollers in said vertical group, the line between the centers of the pair of opposed rollers in said oblique group which is closest to said vertical group being perpendicular to the line between the nip points of the said pair of opposed rollers and the lowermost pair of rollers in said vertical group, and each roller in said pair of rollers in said oblique group having an apron therearound, and means for tensioning said aprons so that the apron on the bottom roller of said pair of rollers contacts the apron on the top roller of said pair of rollers from the nip point of said pair of rollers to the point where the aprons leave said top roller.

References Cited in the file of this patent UNITED STATES PATENTS 1,671,820 Ferrand May 29, 1928 1,722,006 Nigrin et al July 23, 1929 2,025,394 Langen Dec. 24, 1935 2,404,218 Crossley July 16, 1946 2,591,866 Pope Apr. 8, 1952 FOREIGN PATENTS 12,477 Great Britain of 1912 261,043 Great Britain Apr. 14, 1927 892,572 Germany Oct. 8, 1953 

